I have the following bash script which repeats for each image found. It needs to iterated over all html, css and js files, and replace all occurrences of an image within that file.
for image in app/www/images-theme-dark/*.png
do
echo "installing icon" $image
# extract filename from iconpath
iconfile=$(basename $image)
iconPath="images/"$(basename $image)
# replace paths in all files containing icon paths
find app/www -type f \( -name "*.html" -or -name "*.css" -or -name "*.js" \
-or -name "*.appcache" \) \
-exec sed -i '' -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}" \;
done
However when I run the script sed gives:
sed: can't read : No such file or directory
On StackOverflow I've found sed: can't read : No such file or directory But I already had quotes around {}
When I echo the sed command and and execute it on the command line manually there is no error.
I am using GNU sed v4.2.2 on Raspbian GNU/Linux 8.0 (jessie)
Does someone see what could be wrong here?
'' after sed -i?
-i is one difference between GNU sed and sed from mac os.
-i means in-place, that is, edit in the file directly. -i '' means edit in place a file whose name is the empty string. Since probably you don't actually have a file whose name is the empty string, sed complains that it cannot read it.
(Compiling an answer from comments, the know-how is by melpomene and AlexP.)
What is that '' after sed -i?
-i means in-place, that is, edit in the file directly.
-i '' means edit in place a file whose name is the empty string.
Since there probably is no file whose name is the empty string, sed complains that it cannot read it.
Note 1 platform dependency:
The syntax of -i is one difference between GNU sed and sed from mac os.
Note 2 "usual" order of arguments:
The -e switch to indicate the sed code allows having it in between file names.
This is a trap (in which I for example got caught embarassingly), by making you trip over your expectations of what you find where in an sed command line.
It allows
sed -i filename -e "expression" AnotherFileName
which is an unintentionally camouflaged version of
sed -i'NoExtensionGiven' "expression" filename AnotherFileName.
For support on both OSX and Linux, I use a simple if check to see if the bash script is running on OSX or Linux, and adjust the command's -i argument based on that.
if [[ "$OSTYPE" == "darwin"* ]]; then
sed -i '' -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}"
else
sed -i -e 's|$iconPath|images-theme-dark/$iconfile|g' "{}"
fi
In my bash scripts I use something like that (to support both MacOS and Linux distributions):
SEDOPTION=
if [[ "$OSTYPE" == "darwin"* ]]; then
SEDOPTION="-i ''"
fi
sed $SEDOPTION "/^*/d" ./file
-i option for non-macOS. That said, this solution had a weird quirk on my macOS by appending the quotation marks from $SEDOPTION to the filename. I had to resort to the following hackery to prevent that... I tried many other things like piping xargs, swapping single and double quotes, backticks, etc. but this is what worked for me (\x27 represents single-quote): if [[ "$OSTYPE" == "darwin"* ]]; then SEDOPTION='-i \x27\x27'; else SEDOPTION='-i'; fi;
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